单项选择题

On the basis of their models, scientists are of the opinion that______.

A．the climate of the world should be becoming Cooler
B．the new Ice Age will be postponed by the greenhouse effect
C．the warming effect helps to increase the solar effects
D．inertia of the earth's climate to take effect in thousands of years
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单项选择题
A concentration of carbon dioxide in the atmosphere would______.
A．prevent the sun's rays from reaching the earth's surface
B．mean a warming up in the Arctic
C．account for great changes in the climate in the northern hemisphere
D．raise the temperature of the earth's surface
单项选择题
Although the fuel consumption is greater in the northern hemisphere, temperatures there seem to be falling. This is ______.
A．mainly because the levels of carbon dioxide are rising
B．possibly because the ice caps in the poles are melting
C．exclusively due to the effect of the inenia of the earth's climate
D．partly due to variations in the output of solar energy
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